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我想通过notifyDataSetChanged（）这个方法更新我的列表视图，但listview没有得到更新，如果我按回去按钮，并转到上一个活动，然后再次，如果我进来活动，然后它正在更新，我不知道为什么。我尝试了所有可能的解决方案，但没有得到适当的解请帮助下面是我的代码。Listview没有得到更新notifyDataSetChanged方法
这里是我试图链接
ListView not getting updated on calling notifyDataSetChanged()
notifyDataSetChanged() not working
notifyDataSetChanged Android ListView
notifyDataSetChanged not updating ListView
The event of notifyDataSetChanged()
public class Assignment extends Activity {
ListView mListView;
ImageView imageViewCrtAsnm;
String[] stg1;
List<String[]> names2 = null;
DataManipulator dataManipulator;
ArrayAdapter<String> adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.assignment);
imageViewCrtAsnm = (ImageView) findViewById(R.id.createassignment);
mListView = (ListView) findViewById(R.id.displaydata);
imageViewCrtAsnm.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Intent intent = new Intent(Assignment.this,
Assignment_Create.class);
startActivity(intent);
}
});
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View item,
final int position, long id) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
Assignment.this);
alertDialogBuilder.setTitle("Delete Data");
alertDialogBuilder
.setMessage("Click yes to Delete Record!")
.setCancelable(false)
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
String[] delete = names2.get(position);
String idString = delete[0];
long idLong = Long.valueOf(idString);
Log.d("Deleting...", idLong + "");
dataManipulator.delete(idLong);
names2.remove(position);
stg1 = new String[names2.size()];
int x = 0;
String stg;
for (String[] name : names2) {
stg = "Title : " + name[1] + "\n"
+ "Descr : " + name[2]
+ "\n" + "Day's Left : "
+ name[3];
stg1[x] = stg;
x++;
}
adapter.notifyDataSetChanged();
}
})
.setNegativeButton("No",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int id) {
// if this button is clicked, just close
// the dialog box and do nothing
dialog.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
}
});
dataManipulator = new DataManipulator(this);
names2 = dataManipulator.selectAll();
stg1 = new String[names2.size()];
int x = 0;
String stg;
for (String[] name : names2) {
stg = "Title : " + name[1] + "\n" + "Descr : " + name[2] + "\n"
+ "Day's Left : " + name[3];
stg1[x] = stg;
x++;
}
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, stg1);
mListView.setAdapter(new ArrayAdapter<String>(this, R.layout.check,
stg1));
mListView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
}
如果您尝试了所有可能的解决方案，那么就没有解决方案。但是，严肃地说，你至少应该指出你尝试了什么，所以其他人不会向你建议这些解决方案。 – Tafari
@Tafari，我已编辑我的问题，我已经尝试过的链接，但仍然有其他链接，但我不能更新所有 – InnocentKiller
无后顾之忧，现在可以，应该保持这种方式：）就你所知，它并不是我是谁下降了。 – Tafari